<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>2.15</title>
</head>

<body>
    <script>
        const s = '  welcome  ';

            console.log(s.trim());  //"welcome"
            console.log(s.trimStart()); //"welcome  "
            console.log(s.trimEnd());   //"  welcome"
        </script>
    </body>
    
    </html>